Kairuhs kit Manual

Manual – Hardware v2.1 · Firmware v2.13501

This manual covers the v2‑series controller (HW v2.1) and Firmware v2.13501. It consolidates installation, setup, roles, Wi‑Fi configuration, radar behavior, and troubleshooting.

1. Introduction

The Kairuhs Kit is a modular telemetry, HUD, and radar system for RC air and ground vehicles. It supports up to four simultaneous displays, each independently assigned to roles like PFD, MFD, HUD, radar, or ground dashboards. The system adds LoRa/FastLink radio, Wi‑Fi configuration, automatic screen dimming, and a plug‑in temperature sensor.

What’s included in this manual

Hardware v2.1 controller with quad display outputs
LoRa module (optional) and FastLink radio behavior
Light and temperature sensor connections and behavior
Firmware v2.13501 features and configuration (Wi‑Fi AP UI)

Key capabilities

Four display outputs (1.14″ or 1.44″) with per‑screen role and rotation
LoRa port for peer‑to‑peer radar and telemetry
Light sensor for automatic brightness/dimming
Temperature sensor for ambient or component temps (motor/ESC/engine)
Wi‑Fi configuration for all settings; no button module menus
Note: HW v2.1 supports external Wi‑Fi antennas for greater radar/config range. Earlier boards with onboard antennas have reduced FastLink coverage.

2. Kit Overview (Hardware v2.1)

5V display drive for high outdoor brightness
Quad display output; assign any role to any of the 4 ports
Horizontal connectors with side‑exit headers for compact installs
Slim display modules; headers pre‑removed for tighter cockpits
Dedicated LoRa port for LoRadar real‑time tracking and telemetry
Labeled solder pads: 5V • GND • TX • RX for FC UART hookup
Legacy button menus removed; all setup via Wi‑Fi config
Light sensor port (4‑pin) for auto‑dimming
Temperature sensor port (2‑pin) for ambient or component temps
External Wi‑Fi antenna support (v2.1) for extended range

Sensors behavior

Light sensor: detects ambient light and auto‑dims screens for dusk/night operations
Temperature sensor: place on motor, ESC, nitro/gas engine, or use as ambient probe
Caution: Do not mix ports. LoRa must plug into the LoRa port only. Do not insert the LoRa module into a display port. Do not connect FC wiring into sensor ports, or sensors into display/radio ports.

3. Power & Flight Controller Integration

Power sources

Supply 5V via FC‑IN port, USB‑C, or solder to the 5V FC‑IN pad
UART wiring (MAVLink 115200)

UART wiring (MAVLink 115200)

Green → FC RX (connects to FC TX)
Yellow → FC TX (connects to FC RX)
Red → +5V
Black → GND
Protocol: MAVLink
Baud rate: 115200

SpeedyBee F405 Wing / F405 Wing Mini

Plugs directly via the 6‑pin JST UART (TX/RX/5V/GND). No adapters required
Tip: In INAV, confirm the correct UART and set MAVLink 115200 under Ports.

4. Installation (Displays • LoRa • Sensors)
Displays

Insert 8‑pin cables fully until seated; do not force
Match orientation: Red = 5V, Black = GND
Avoid mixing 1.14″ and 1.44″ displays in the same build to prevent layout issues

LoRa Module

Plug into the LoRa port only; never into a screen port

Sensors

Temp sensor uses a 2‑pin connector
Light sensor uses a 4‑pin connector
All headers are labeled on the PCB; verify before powering on

5. Startup Behavior

Boot splash shows firmware version and link indicators
MAVLink active: green boxes indicate a good link
LoRa active: green boxes indicate a good link

6. Assignable Display Roles

Each display (1–4) can be assigned independently in the config. You can duplicate roles across screens and rotate each display individually.

6.1 Primary Flight Display (PFD)

Speed tape with 3‑second trend vector
Roll and pitch horizon
Altitude tape
Compass and heading (compact or full layout)
Return‑to‑home arrow and distance to home
Variometer
Satellite count; icon turns green at 7 or more satellites
Selectable units for speed and altitude

6.2 Multifunction Display (MFD)

Throttle position
Flight mode display (MAN • ACR • HOR)
Voltage or fuel‑style gauge
Current (A) and power (W)
Battery remaining (on 1.14″)
Battery voltage, per‑cell voltage, cell count
Flap and gear indicators
Attitude indicators: roll, pitch, yaw
RC channel mapping: throttle, flight mode, gear, flaps can be assigned to any channel 1–8 and inverted if needed

6.3 HUD Display

Speed, altitude, pitch, roll, heading
Distance to home
Satellite count turns red when no satellites are active
HUD vertical offset adjustable on 1.14″
Optional invert for reflective HUD glass alignment

6.4 Air Radar Display

Live tracking of real and simulated targets
Circular radar layout with adjustable range and compass ring
Labels: ID (vehicle or pilot), altitude, distance
Target dots: cyan = friendly, red = hostile
Top legend: radio status (active/inactive), satellite count, current radar range
Bottom legend: vehicle ID, pilot ID, radio node presence
Range scaling via transmitter; assign any channel 1–8 and set min/max endpoints in feet
Satellite count colors:
Orange: fewer than 7 satellites
White: 8 to 18 satellites
Cyan: 19 or more satellites
Note: More satellites yield better positional accuracy and visibility on others’ radars.

6.5 Track Dash 1 (Ground)

Throttle bar segment
Speed
Temperature
Tachometer derived from throttle
Voltage and arm time
Shift-light bar LEDs (green → yellow → red) with flashing limiter at the top
Corner LEDs:
Top-left: Temperature (green, yellow, red, flashing red at critical)
Bottom-left: Battery (green, red, flashing red at critical)
Top-right: GPS satellite count (red <7, yellow 7–17, green 19+)
Bottom-right: MAVLink activity (green if active, dim if stale)

6.6 Gauges (Ground)

Voltage gauge
Temperature gauge
Fuel level gauge (derived from voltage)
Temperature LED (top-center):
Dim red = idle
Solid red ≥ 75 °C
Flashing red ≥ 85 °C (critical)

6.7 Street Dash (Ground)

Center: RPM gauge (derived from throttle)
Right: Speed gauge
Left: Fuel gauge (derived from voltage), Temperature gauge

6.8 Radio (Ground)

Touchscreen-style radio with on-timer roll

6.9 Track Dash 2 (Ground)

Voltage display
Fuel level (derived from voltage)
Temperature display with LED indicator
Satellite count
Left bar-segment gauge: RPM (derived from throttle)
Right bar-segment gauge: Speed (up to 55 mph)
Selectable speed units (MPH / KMH / Knots)
Theme color applied to gauge elements

6.10 License Plate (Ground)

Plate styles with custom plate text

6.11 Inclinometer (Ground)

Two large gauges:
Left: Compass
Right: Attitude (roll and pitch)
Voltage displayed at top
Speed displayed at bottom
Theme color applied

6.12 Radar (ground)

Landscape square-grid layout with theme-colored grid
Larger fonts in key areas for readability
Labels: ID, altitude, distance (same as Air Radar)
Target colors: cyan = friendly, red = hostile
Same functionality as the circular Air Radar, adapted for ground use

7. Configuration (Wi‑Fi Access Point Mode)

7.1 Enter AP Mode

Power on or reset the device and immediately hold BOOT
AP instructions will appear on screen
Connect to the WiFi network shown (default: KAIRUHS_Config, password: kairuhs123)
Open a browser and go to http://192.168.4.1

7.2 Tabs and settings

Tabs: Basics, Gauges, Radio, Ground, Advanced, Manual

Basics

Warnings with enable/disable and threshold: Stall, Overspeed, Overcurrent, Low Altitude, Altitude Ceiling, Low Voltage
Behavior: bold red box centered on screen with uppercase label (for example VOLTAGE, STALL, ALTITUDE)
Per‑screen behavior: choose which displays show the overlay; HUD and Radar support whole‑screen green to red flash
Units: speed in mph, kph, or knots; altitude and distance in feet, meters, or yards
Display customization: brightness 1–10; PFD compass layout compact or full; MFD fuel gauge mode voltage or fuel bar
Identity and labels: vehicle ID 4 characters, pilot ID 4 characters, team selection, color mode (all colors, specific colors, or no colors)
Radar label and display toggles: radar range; maximum target range; show ID label, altitude, distance; eject factor 1.0 ejects at edge, 1.2 ejects slightly past; show targets mode and label source (pilot or vehicle)

Gauges

Choose across 12 air gauges on 3 screen pages
Tune positions, face size, and page locations
Available gauge types: airspeed (IAS), altimeter, VSI (vertical speed), turn coordinator, heading, RPM, manifold pressure, oil pressure, oil temperature, fuel quantity, coolant temperature, attitude

Radio

Master radio status shows FastLink and LoRa
Select off, LoRa only, FastLink only, or hybrid
Set transmit power and channel; long‑range toggle
Long‑range off gives faster updates but shorter distance; long‑range on gives slower updates but longer distance
Compliance: match settings with other pilots for radar visibility; follow local regulations (bands, power, duty‑cycle, LBT). A band helper is provided to get started
Legal disclaimer: you are responsible for ensuring your radio settings comply with local regulations; Kairuhs is not responsible for misuse or violations
Maturity note: radio and radar are evolving; occasional bugs may exist. Please report findings

Ground

Speed units, dash theme color, slot roles
Throttle channel and inversion
License plate text and type
Feature set is early and will expand

Advanced

Display type 1.14″ or 1.44″
Rotation per screen
1.14″ specifics: air roles up or down only; car roles landscape only
Slot roles: assign any role to any screen
HUD vertical offset for reflective HUD alignment on 1.14″
RC mapping (flaps, gear, flight mode, throttle) mapped to channels 1–8 with inversion
Adjustable radar range: enable or disable, select control channel 1–8, invert, and set minimum and maximum endpoints in feet

Manual

In‑UI help reference

Save behavior

Use Save Settings at the bottom of the page to write changes
The device reboots into normal mode with the new configuration

8. LoRa and FastLink Radar Summary

Real‑time peer‑to‑peer radar for nearby targets in air and on ground; supports up to about 15 pilots. Higher network congestion reduces update rate
Hybrid mode runs FastLink for close‑range fast updates and LoRa for long‑range slower updates

Indicative range

With HW v2.1 external antennas, FastLink can reach about 1300 ft ground to air at 20 Hz. Air to air typically goes farther. LoRa extends beyond that; LoRa maximum range is untested in this release
Boards using onboard antennas have reduced range

Display features

Circular air radar and landscape square‑grid ground radar
Target labels: ID, altitude, distance
Colors: cyan friendly, red hostile
Top legend: radio status, satellite count, current range
Bottom legend: vehicle ID, pilot ID, radio node presence

Satellite color scale

Orange: fewer than 7 satellites
White: 8 to 18 satellites
Cyan: 19 or more satellites

Simulation

Spawn control: enable or disable sims, cap total sim count, set spawn probability
Class types: jetliners fast and high about 50 percent, warbirds about 20 percent, props about 30 percent
Behavior: randomized heading and climb, pursuer mode to chase your position, turn and speed by class, loop‑back if overshot
Filters: show all, friendlies only, hostiles only, or none
Tuning in browser: spawn rate, maximum count, visibility filters, pursuit logic, friend or foe mix

9. Troubleshooting

No MAVLink data

Verify TX and RX are not reversed and baud is 115200
Confirm the correct UART in INAV Ports

No radar targets

Ensure the radio module is connected and enabled in the Radio tab
Check Sim toggles and visibility filters

Blank display

Confirm the correct display type and rotation in Advanced

Wi‑Fi config will not load

Try another device or browser. Fully power‑cycle by unplugging and plugging back in

Port mistakes (common)

LoRa in a screen port risks damage; double‑check labels before powering on
FC wiring into sensor headers or sensors into display/radio headers will prevent communication

10. Technical Specifications

Component	Weight (g)	Dimensions (mm)
AHI Controller Board	14.7	28.9 × 53.3 × 13.2
1.44″ Display (each)	19.9	29.4 × 45.9 × 12.2
1.14″ Display (each)	19.2	28.0 × 40.0 × 11.5
LoRa Module (optional)	8.0	17.0 × 28.0 × 6.0
Cables + Misc.	5	—

11. Support & Community

Email: kairuhsconsole@gmail.com
Thingiverse: https://www.thingiverse.com/kairuhshq/designs
Facebook: https://www.facebook.com/groups/1231576258453632/
YouTube: https://www.youtube.com/@KairuhsConsole
Instagram: https://www.instagram.com/kairuhshq/
We improve the platform through community feedback. Send build photos, flight footage, and notes; we may feature your work.

Thanks for flying & driving with Kairuhs.